Almost put this in the OT/Humor section, but that didn't seem right, since there's a good chance that outdoorsy folk like us will see clouds like this from time to time. :) Anyway, enjoy - there are some truly fascinating photos here...
Strange Clouds (http://pic1.funtigo.com/valuca/?g=25544746&cr=1)
This is real taken by my son in Anartica simular to the site.
(http://img.photobucket.com/albums/v356/Bateau1/Mt.jpg)
Of course, the lenticular cloud formations could be a source of a lot of UFO sightings. ;) Be a pretty simple mistake to make if you're not familar with the formation of that type of cloud.